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    Electronic apparatus comprising a switching-type output stage, corresponding circuit arrangement and method
    11.
    发明授权
    Electronic apparatus comprising a switching-type output stage, corresponding circuit arrangement and method 有权

    公开(公告)号：US11515861B2

    公开(公告)日：2022-11-29

    申请号：US17350216

    申请日：2021-06-17

    Applicant: STMicroelectronics S.r.l.

    Inventor： Giovanni Gonano ,  Marco Raimondi

    IPC: H03K3/017 ,  H03F3/217 ,  H03K5/24

    Abstract: An embodiment apparatus comprises a switching-type output power stage, a modulator circuit configured for carrying out a pulse-width modulation and converting an electrical input signal into an input signal pulsed between two electrical levels, having a mean value proportional to the amplitude of the input signal, and a circuit arrangement for controlling saturation of an output signal supplied by the switching-type output power stage. The circuit arrangement comprises a pulse-remodulator circuit, between the output of the modulator circuit and the input of the switching-type output power stage, that is configured for supplying, as a driving signal to the switching-type output power stage, a respective modulated signal pulsed between two electrical levels, measuring a pulse width as pulse time interval elapsing between two consecutive pulsed-signal edges of the pulsed input signal, and, if the measurement indicates that the latter is below a given minimum value, remodulating the pulsed input signal.

    METHOD AND CIRCUIT FOR TESTING AN AUDIO HIGH-FREQUENCY LOUDSPEAKER BEING PART OF A LOUDSPEAKER SYSTEM
    13.
    发明申请
    METHOD AND CIRCUIT FOR TESTING AN AUDIO HIGH-FREQUENCY LOUDSPEAKER BEING PART OF A LOUDSPEAKER SYSTEM 审中-公开
    用于测试扬声器系统的音频高频扬声器的方法和电路

    公开(公告)号：US20140023198A1

    公开(公告)日：2014-01-23

    申请号：US14036506

    申请日：2013-09-25

    Applicant: STMicroelectronics S.r.l.

    Inventor： Edoardo Botti ,  Giovanni Gonano ,  Pietro Mario Adduci

    IPC: H04R29/00

    CPC classification number: H04R29/001 ,  H04R1/26 ,  H04R29/003 ,  H04R2420/05

    Abstract: The present invention relates to a method and a circuit for testing a tweeter, said tweeter being part of a loudspeaker system, wherein the method includes the steps of: applying a high-frequency voltage signal to one terminal of said tweeter, said high-frequency voltage signal being generated by first electronic means; applying a constant voltage signal to the other terminal of said tweeter, said constant voltage signal being generated by second electronic means; measuring a current Iload that flows through said tweeter into said second electronic means; determining a connect/disconnect state of said tweeter from the value of said current.

    Abstract translation: 本发明涉及一种用于测试高音单元的方法和电路，所述高音单元是扬声器系统的一部分，其中该方法包括以下步骤：将高频电压信号施加到所述高音单元的一个端子，所述高频 电压信号由第一电子装置产生; 向所述高音单元的另一端施加恒定电压信号，所述恒定电压信号由第二电子装置产生; 测量流过所述高音单元的电流Iload进入所述第二电子装置; 从所述电流的值确定所述高音单元的连接/断开状态。

    Noise shaper fader
    14.
    发明授权
    Noise shaper fader 有权

    公开(公告)号：US11804814B1

    公开(公告)日：2023-10-31

    申请号：US17719613

    申请日：2022-04-13

    Applicant: STMicroelectronics S.r.l.

    Inventor： Francesco Stilgenbauer ,  Paolo Cacciagrano ,  Giovanni Gonano

    IPC: H03G3/34 ,  H04R3/00

    CPC classification number: H03G3/344 ,  H04R3/00 ,  H03G2201/103 ,  H04R2430/01

    Abstract: A digital audio playback circuit includes a noise shaping circuit configured to receive an input digital audio signal, and a digital to analog converter (DAC) configured to convert the input digital audio signal to a pre-amplified output analog audio signal according to a gain ramp defined by a gain control signal. A muting circuit is configured to compare input digital audio signal to a threshold and assert a mute control signal when the input digital audio signal is below the threshold. An analog gain control ramp circuit is configured to generate the gain control signal in response to the mute control signal to cause the gain ramp to ramp down. An amplifier is configured to amplify the pre-amplified output analog audio signal for playback by an audio playback device.

    PWM DRIVING CIRCUIT AND METHOD
    15.
    发明申请
    PWM DRIVING CIRCUIT AND METHOD 有权

    公开(公告)号：US20220173706A1

    公开(公告)日：2022-06-02

    申请号：US17107269

    申请日：2020-11-30

    Applicant: STMicroelectronics S.r.l. ,  STMicroelectronics (Shenzhen) R&D Co. Ltd.

    Inventor： Hong Wu Lin ,  Giovanni Gonano ,  Edoardo Botti

    IPC: H03F3/217 ,  H03K17/687 ,  H04R3/00

    Abstract: In an embodiment, a method for shaping a PWM signal includes: receiving an input PWM signal; generating an output PWM signal based on the input PWM signal by: when the input PWM signal transitions with a first edge of the input PWM signal, transitioning the output PWM signal with a first edge of the output PWM signal; and when the input PWM signal transitions with a second edge before the first edge of the output PWM signal transitions, delaying a second edge of the output PWM signal based on the first edge of the output PWM signal.

    ELECTRONIC APPARATUS COMPRISING A SWITCHING-TYPE OUTPUT STAGE, CORRESPONDING CIRCUIT ARRANGEMENT AND METHOD
    16.
    发明申请
    ELECTRONIC APPARATUS COMPRISING A SWITCHING-TYPE OUTPUT STAGE, CORRESPONDING CIRCUIT ARRANGEMENT AND METHOD 有权

    公开(公告)号：US20220021375A1

    公开(公告)日：2022-01-20

    申请号：US17350216

    申请日：2021-06-17

    Applicant: STMicroelectronics S.r.l.

    Inventor： Giovanni Gonano ,  Marco Raimondi

    IPC: H03K3/017 ,  H03K5/24 ,  H03F3/217

    Abstract: An embodiment apparatus comprises a switching-type output power stage, a modulator circuit configured for carrying out a pulse-width modulation and converting an electrical input signal into an input signal pulsed between two electrical levels, having a mean value proportional to the amplitude of the input signal, and a circuit arrangement for controlling saturation of an output signal supplied by the switching-type output power stage. The circuit arrangement comprises a pulse-remodulator circuit, between the output of the modulator circuit and the input of the switching-type output power stage, that is configured for supplying, as a driving signal to the switching-type output power stage, a respective modulated signal pulsed between two electrical levels, measuring a pulse width as pulse time interval elapsing between two consecutive pulsed-signal edges of the pulsed input signal, and, if the measurement indicates that the latter is below a given minimum value, remodulating the pulsed input signal.

    Switch circuit, corresponding device and method
    17.
    发明授权
    Switch circuit, corresponding device and method 有权

    公开(公告)号：US10523197B2

    公开(公告)日：2019-12-31

    申请号：US16261267

    申请日：2019-01-29

    Applicant: STMicroelectronics S.r.l.

    Inventor： Edoardo Botti ,  Giovanni Gonano

    IPC: H03K17/687 ,  H03F3/217 ,  H03K17/10

    Abstract: A bi-directional switch circuit includes first and second transistors having their control electrodes coupled at a first common node and the current paths coupled at a second common node in an anti-series arrangement. First and second electrical paths coupled between the first common node and the first and second transistors, respectively, include first and second switches switchable between a conductive state and a non-conductive state. A third electrical path between the first and second common nodes includes a third switch switchable between a conductive state and a non-conductive state. The third switch is coupled with the first and second switches by a logical network configured to switch the third switch to the conductive state with the first and second switches switched to the non-conductive state, and to the non-conductive state with either one of the first and second switches switched to the conductive state.

    Method for load measurement in switching amplifiers, corresponding device and amplifier
    18.
    发明授权
    Method for load measurement in switching amplifiers, corresponding device and amplifier 有权

    公开(公告)号：US10348249B2

    公开(公告)日：2019-07-09

    申请号：US15958848

    申请日：2018-04-20

    Applicant: STMicroelectronics S.r.l.

    Inventor： Giovanni Gonano

    IPC: H03F1/08 ,  H03F3/45 ,  H03F3/183 ,  H03F3/217 ,  G01R31/28 ,  H04R29/00

    Abstract: A method can be used to measure a load driven by a switching amplifier having a differential input, an LC output demodulator filter and a feedback network between the amplifier output and the differential input. The amplifier is AC driven in a differential and in a common mode by applying a common. The feedback network provides feedback towards the differential input from downstream the LC demodulator filter by computing the impedance of the load as a function of the differential mode output current and the common mode output current. The feedback network provides feedback towards the differential input from upstream the LC demodulator filter by measuring the impedance value of the inductor of the LC demodulator filter, and computing the impedance of the load as a function of the differential mode output current, the common mode output current and the impedance value of the inductor of the LC demodulator filter.

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